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      Question

      The average of 18 numbers is 40, and the average of the

      first 9 numbers is 45. Find the average of the remaining 9 numbers.
      A 35 Correct Answer Incorrect Answer
      B 33 Correct Answer Incorrect Answer
      C 30 Correct Answer Incorrect Answer
      D None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Sum of 18 numbers = 18 × 40 = 720 Sum of first 9 numbers = 9 × 45 = 405 Now, sum of last 9 numbers = (720 – 405) = 315 Therefore, average of last 9 numbers = 315/9 = 35

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